[BUG]: gc listen infinitely resends events

[mauricedoepke]

Describe the bug
When using the gc listen command, the cli resends successfully acknowledged events over and over until the cli is closed.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://webhook.site/ to create a link for debugging webhooks
2. Use the created link with the gc listen command, e.g.: gc listen --forward https://webhook.site/653ce959-f977-4053-a245-1b47dec3170d
3. Do something that triggers a webhook event, e.g. creating a subscription for a user

Expected behavior
The cli forwards the event only once, when the server responds with a http code 200. The cli should only retry forwarding the event if the server responds with an error code.

Screenshots

Desktop (please complete the following information):

• Hardware: MacBook Pro m1
• OS: macos 13.0.1